Open the windows of setting & click the tab of “Accounts” as above. Add your desire email account by clicking “Add another email…” as above under the section of “Send mail as:”

Type the display name & email address that we intend to integrate than click “Next Step” button

Select the “Send through Gmail..” radio button & click “Next Step”

Click the “Send Verification” Button to complete process & follow instruction As mention by Google at above

After completion of verification process, we will see The added email account list in dropdown menu at “From” Section of email compose as above. Select The address through which you intend to send email

After completion of verification process, we will see The added email account list in dropdown menu at “From” Section of email compose as above. Select The address through which you intend to send email